dhl shipfaanti-dust smoke allergies adjustable reusable with 2 mask pad for pm2.5

faanti-dust smoke allergies adjustable reusable mask with 2 mask pad for pm2.5 k.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.